gstreamer/subprojects/gst-docs/examples/tutorials/playback-tutorial-7.c

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#include <gst/gst.h>
#ifdef __APPLE__
#include <TargetConditionals.h>
#endif
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int
tutorial_main (int argc, char *argv[])
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{
GstElement *pipeline, *bin, *equalizer, *convert, *sink;
GstPad *pad, *ghost_pad;
GstBus *bus;
GstMessage *msg;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Build the pipeline */
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pipeline =
gst_parse_launch
("playbin uri=https://gstreamer.freedesktop.org/data/media/sintel_trailer-480p.webm",
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NULL);
/* Create the elements inside the sink bin */
equalizer = gst_element_factory_make ("equalizer-3bands", "equalizer");
convert = gst_element_factory_make ("audioconvert", "convert");
sink = gst_element_factory_make ("autoaudiosink", "audio_sink");
if (!equalizer || !convert || !sink) {
g_printerr ("Not all elements could be created.\n");
return -1;
}
/* Create the sink bin, add the elements and link them */
bin = gst_bin_new ("audio_sink_bin");
gst_bin_add_many (GST_BIN (bin), equalizer, convert, sink, NULL);
gst_element_link_many (equalizer, convert, sink, NULL);
pad = gst_element_get_static_pad (equalizer, "sink");
ghost_pad = gst_ghost_pad_new ("sink", pad);
gst_pad_set_active (ghost_pad, TRUE);
gst_element_add_pad (bin, ghost_pad);
gst_object_unref (pad);
/* Configure the equalizer */
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g_object_set (G_OBJECT (equalizer), "band1", (gdouble) - 24.0, NULL);
g_object_set (G_OBJECT (equalizer), "band2", (gdouble) - 24.0, NULL);
/* Set playbin2's audio sink to be our sink bin */
g_object_set (GST_OBJECT (pipeline), "audio-sink", bin, NULL);
/* Start playing */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* Wait until error or EOS */
bus = gst_element_get_bus (pipeline);
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msg =
gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* Free resources */
if (msg != NULL)
gst_message_unref (msg);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}
int
main (int argc, char *argv[])
{
#if defined(__APPLE__) && TARGET_OS_MAC && !TARGET_OS_IPHONE
return gst_macos_main ((GstMainFunc) tutorial_main, argc, argv, NULL);
#else
return tutorial_main (argc, argv);
#endif
}